Thorne Research
Vitamin K
78/100
SUPPIE SCORE
78/100
EFFICACY
Medium
SAFETY
96/100
CLEANLINESS
What Does Vitamin K Do?
Thorne's 3-K Complete delivers a high-potency blend of vitamin K1, MK-4, and MK-7 that supports bone mineralization and vascular health through complementary mechanisms, backed by multiple clinical studies on each form.
How does combining K1 with MK-4 and MK-7 forms compare to taking a single form of vitamin K?
What should I know about taking this alongside blood-thinning medications?
Is this product suitable for daily bone and cardiovascular support routines?
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What Are the Benefits of Vitamin K?
Based on proven scientific research
Bone HealthStrong
Cardiovascular SupportModerate
Calcium UtilizationStrong
Good For:
What Are the Side Effects of Thorne Research Vitamin K?
Always consult your health practitioner if in doubt.
RiskMedium Risk
Overview
•Vitamin K (especially high-dose K2 forms) can interfere with anticoagulant medications such as warfarin (Coumadin); concurrent use should be avoided or closely monitored by a physician.
•The 5 mg MK-4 dose exceeds typical dietary intake but aligns with studied supplemental ranges; no serious adverse effects reported in trials at this level.
•Generally well-tolerated with low risk of side effects in healthy adults at labeled doses.
•Contains no common allergens such as gluten, dairy, or soy based on listed ingredients.
•Discontinue use and seek medical advice if unusual bleeding or bruising occurs.
Potential Side Effects
Negative Interactions
Inactive Ingredients
Microcrystalline cellulose
Low RiskHypromellose (derived from cellulose) capsule
Low RiskSilicon dioxide
Low RiskVitamin e (mixed tocopherols)
GoodWhat Are the Ingredients in Thorne Research Vitamin K?
Vitamin K1
1 mg
Vitamin K2 (MK-4)
5 mg
Vitamin K2 (MK-7)
90 mcg
Microcrystalline Cellulose
Hypromellose (derived from cellulose) capsule
Silicon Dioxide
Vitamin E (Mixed Tocopherols)
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Dosage & Bioavailability
How the active doses and forms in Vitamin K compare to the research.
•Vitamin K2 (MK-4) — 5 mg per serving; high dose compared to typical 1-5 mg supplemental ranges, synthetic form with good absorption when taken with dietary fat.
•Vitamin K1 — 1 mg per serving; exceeds standard 100-500 mcg ranges used in bone and coagulation studies.
Sources & References
Vitamin k
Information from www.thorne.com
Vitamin k formerly 3 k complete 60 capsules
Information from www.oakwaynaturals.com
3 k complete
Information from www.thorne.com
PMC7230802
Information from pmc.ncbi.nlm.nih.gov
PMC7973400
Information from pmc.ncbi.nlm.nih.gov
Vitamin k formerly 3 k complete 60 capsules
Information from www.oakwaynaturals.com
Frequently Asked Questions
Common questions about Thorne Research Vitamin K